Question

You are presented with an unknown single cell organism. As you study the cell, you note that it lacks a nucleus, it has a unusual cell walls and that its rRNA is unique. To which domain would you assign this organism?

Answer 1

Prokaryotes are organisms whose cells lack a nucleus and other organelles. It is divided into two groups: bacteria and archaea.

Archaea are single-celled microorganisms that lack a cell nucleus and membrane-bound organelles. Archaea have a semi-rigid cell wall. Some lack a cell wall altogether. The cell wall lack peptidoglycan. Genome rearrangement events result in unique fragmentation patterns of noncoding RNA genes that require elaborate maturation pathways to yield functional transcripts.